lib: fix beforeExit not working with -e#8821
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bnoordhuis merged 1 commit intonodejs:masterfrom Oct 24, 2016
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Commit 93a44d5 ("src: fix deferred events not working with -e") defers
evaluation of the script to the next tick.
A side effect of that change is that 'beforeExit' listeners run before
the actual script. 'beforeExit' is emitted when the event loop is
empty but process.nextTick() does not ref the event loop.
Fix that by using setImmediate(). Because it is implemented in terms
of a uv_check_t handle, it interacts with the event loop properly.
Fixes: #8534
R=@Fishrock123